2009 Audi A8 vs. 2006 Audi A4
To start off, 2009 Audi A8 is newer by 3 year(s). Which means there will be less support and parts availability for 2006 Audi A4. In addition, the cost of maintenance, including insurance, on 2006 Audi A4 would be higher. At 4,172 cc, 2009 Audi A8 is equipped with a bigger engine. In terms of performance, 2009 Audi A8 (329 HP @ 6500 RPM) has 129 more horse power than 2006 Audi A4. (200 HP @ 5100 RPM). In normal driving conditions, 2009 Audi A8 should accelerate faster than 2006 Audi A4. With that said, vehicle weight also plays an important factor in acceleration. 2006 Audi A4 weights approximately 25 kg more than 2009 Audi A8.
Because 2009 Audi A8 is four wheel drive (4WD), it will have significant more traction and grip than 2006 Audi A4. In wet, icy, snow, or gravel driving conditions, 2009 Audi A8 will offer significantly more control. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, 2009 Audi A8 (431 Nm @ 3500 RPM) has 150 more torque (in Nm) than 2006 Audi A4. (281 Nm @ 1800 RPM). This means 2009 Audi A8 will have an easier job in driving up hills or pulling heavy equipment than 2006 Audi A4.
Compare all specifications:
| 2009 Audi A8 | 2006 Audi A4 | |
| Make | Audi | Audi |
| Model | A8 | A4 |
| Year Released | 2009 | 2006 |
| Body Type | Sedan | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 4172 cc | 1983 cc |
| Valves per Cylinder | 5 valves | 4 valves |
| Horse Power | 329 HP | 200 HP |
| Engine RPM | 6500 RPM | 5100 RPM |
| Torque | 431 Nm | 281 Nm |
| Torque RPM | 3500 RPM | 1800 RPM |
| Engine Bore Size | 84.5 mm | 82.5 mm |
| Engine Stroke Size | 93 mm | 92.8 mm |
| Drive Type | 4WD | Front |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 5 doors |
| Vehicle Weight | 1855 kg | 1880 kg |
| Vehicle Length | 5060 mm | 4590 mm |
| Vehicle Width | 1900 mm | 1780 mm |
| Vehicle Height | 1450 mm | 1430 mm |
| Wheelbase Size | 2950 mm | 2660 mm |
| Fuel Consumption Overall | 8.8 L/100km | 9.6 L/100km |
| Fuel Tank Capacity | 90 L | 63 L |
